124 ON SEEDLINGS 



nerved with a lateral nerve running up each lobe, surface with a few 

 hairs. The first pair as in many other Composite are opposite. 



Madia elegans, Don. 



Hypocotyl erect, terete, glabrous, 5-6 cm. long, light green or 

 colourless. 



Cotyledons broadly spathulate, emarginate, obtuse, sessile, con- 

 nate at the base, fleshy, glabrous, dark green, one-nerved, the nerve 

 only apparent at the base of the lamina. 



Stem ascending, herbaceous, pubescent ; 1st internode about 

 2 mm. long. 



First leaves simple, entire, cauline, opposite, decussate, linear, 

 subacute, cilia te, thickly covered with hairs, with those on the 

 under side much smaller, light green, distinctly one-nerved. 



Layia platyglossa, A. Gray. 



Achene obovate or spathulate, ribbed and covered with numerous 

 hairs ; pappus short, coronate. 



Seed conforming in shape to the achene, exalbuminous ; testa 

 membranous, thin ; hilum inconspicuous. 



Embryo straight, filling the interior of the seed, colourless ; coty- 

 ledons spathulate, obtuse, emarginate (on account of a depression of 

 the pericarp beneath the style), sessile ; radicle terete, obtuse, not 

 quite so long as the cotyledons. 



Layia heterotricha, Hook, et Arn. 

 (fig. 466). 



Hypocotyl erect, terete, glabrous, 

 1-2-1-5 cm. long, light green or colour- 

 less. 



Cotyledons spathulate, obtuse, 

 emarginate, tapering to a long nar- 

 row base but hardly petiolate, fleshy, 

 light green, indistinctly one-nerved, 

 glabrous. 



Stem with the primary internodes 

 but slightly developed. 



'~ Laterotricha - First leaves linear- spathulate ; the 



first pair are opposite, acute, denticu- 

 late, tapering to the base but hardly petiolate, hairy, with a distinct 

 midrib. 



The seedling of Layia elegans, Torr. et Gray, closely resembles 

 the above. 



